<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <div>
            <span>全选:</span>
            <input type="checkbox" v-model="allChecked" @change="toggleAll" />
            <button @click="toggleSelection">反选</button>
            <ul>
                <li v-for="(item, index) in arr" :key="index">
                    <input type="checkbox" v-model="item.checked" />
                    <span>{{ item.name }}</span>
                </li>
            </ul>
        </div>
    </div>
    <script src="./vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                arr: [
                    { name: "猪八戒", checked: false },
                    { name: "孙悟空", checked: false },
                    { name: "唐僧", checked: false },
                    { name: "白龙马", checked: false },
                ],
                allChecked: false,
            },
            methods: {
                toggleAll() {
                    this.arr.forEach(item => {
                        item.checked = this.allChecked;
                    });
                },
                toggleSelection() {
                    this.arr.forEach(item => {
                        item.checked = !item.checked;
                    });
                }
            },
            watch: {
                arr: {
                    handler(newVal) {
                        this.allChecked = newVal.every(item => item.checked);
                    },
                    deep: true
                }
            }
        });
    </script>
</body>

</html>